Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478105ac295eddb…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 11:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 11f57907b818ff3a2ebda00ce888f9c8 SHA-1: 3f61e16f2a1d038166528e04f822df33620b69c2 SHA-256: a478105ac295eddb190f1f196c5ab18921fa79ab13b4ebf587f6aa400aa70b10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=persuasive+communication+textbook+pdf PDF link annotation
    • http://ablerexthailand.com/userfiles/files/77093483424.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/zebinorurororelokojobuj.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161008514cb981---puteliridiwel.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/20432550002.pdfIn PDF document text
    • http://geotersrl.it/file/80458683158.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/44873496552.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kagawifasamilozafulokerux.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/49796009015.pdfIn PDF document text
    • http://elskenecologie.nl/files/kefatojorulasu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zafoxujasedusegatefutem.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8346d6cf3---19196061468.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/55592384558.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c0a95c757508e9e8fee30fd3fbee7261/88593533520.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8a32970---49980823232.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16089acb50d5e1---55696873946.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/baxujana.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tenab.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/o2f3bcndu1irrr54b6g62npq01/35659041814.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pebukezadepiri.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/72987594012.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79a6c4b91---26899720379.pdfIn PDF document text
    • http://honda-vo.com/upload/file/61577396024.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e322d4a96---82417370100.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xodasejedo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/80983945270.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 11236 bytes
SHA-256: a26d7ffdde388e1cda1c41d129c992cf3f331eae718df7d92034ce411fab4555
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16020 bytes
SHA-256: f88f8f7b64b4b9df4f695d31384487ef4fe6dfb522609d6f2efa5dff771484b7
font_02_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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